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Chemical Reactions
Test Description: Chemical Reaction Unit Test Review
Instructions: Answer all questions to get your test result.
1) Which of the following best describes a mixture?
A
A combination of two or more substances that are not chemically combined
B
A pure substance that cannot be separated
C
A single element with unique properties
D
A pure substance that cannot be separated
2) If I add vinegar to baking soda, a chemical reaction takes place and carbon dioxide is produced. Which of the following will increase the speed of the chemical reaction?
A
use an inhibitor
B
decrease the concentration of the vinegar
C
decrease the surface area of the baking soda
D
increase the temperature of the vinegar
3) David watches a burning candle to determine whether a chemical reaction is taking place. Which of these observations shows evidence of a chemical reaction?
A
The candle gives off light and heat.
B
The wax is melting.
C
The color of the candle is blue.
D
The candle is in a glass jar.
4) In a chemical reaction, if more energy is required to make the chemical bonds than to break them apart, the reaction is endothermic, so we see a
A
no change in temperature
B
increase in temperature
C
Exothermic
D
Decrease in temperature
5) Which of the following is an example of a homogenous mixture?
A
pizza
B
milk
C
trail mix
D
salad dressing
6) An example of a heterogenous mixture is
A
ocean water
B
lemonade
C
chocolate milk
D
pepperoni pizza
7) What is an example of a colloid?
A
Snow Globe
B
Oil and Water
C
Milk
8) __________ is known as the universal solvent because it dissolves more solutes than any other solvent.
A
Vinegar
B
Water
C
Hydrochloric acid
D
Salt
9) A solute is different than a solvent because a SOLUTE...
A
is always a liquid. ex: coffee
B
is the thing that dissolves another substance. ex: water
C
is the thing that is getting dissolved. ex: sugar
D
is the thing that creates a chemical reaction. ex: heat
10) A compound is a substance that can be broken down into simpler substances and is made from atoms of two or more elements. Which of the following is not a compound?
A
carbon dioxide
B
table salt
C
gold
D
glucose
11) Which of the following is the best example of a suspension?
A
Sugar dissolved in water
B
Rocks in a glass of water
C
Milk and water stirred together
D
Oil floating on top of water
12) The choices below list one example of a physical change and two examples of a chemical change. Which is a physical change?
A
A candle is burned, and gives off heat and light
B
Carbon dioxide forms when baking soda is added to vinegar
C
Water turns to ice
13) Mr. Bowman’s science class is learning that substances can change in many ways. Sometimes a change will produce a new substance. This is called a chemical change. Which of the following is an example of a chemical change?
A
egg frying in a pan
B
water freezing into ice
C
lump of play dough being broken in two
D
paper being cut
14) A chemical change differs from a physical change because in a chemical change a substance
A
changes shape
B
changes into another substance.
C
changes into another state of matter
D
changes color.
15) According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
A
The mass of reactants is greater
B
The mass of products is sometimes greater
C
The masses are always equal.
D
There is no relationship.
16) The fire in a fireplace is an example of an exothermic reaction. Explain what happens in an exothermic reaction.
A
heats, up releases energy
B
heats up. absorbs energy
C
heats up only
D
heats up, has no energy
17) Endothermic is
A
when energy is absorbed
B
when energy has a party
C
this is hurts my brain
D
when energy is released
18) When chemical reactions break down a complex compound into two or more simpler compounds we call this kind of chemical reaction ______.
A
cool
B
synthesis
C
decomposition
D
not cool
19) synthesis
A
come to the front
B
combining 2 or more things
C
built
D
the study of the ocean
20) Which equation represents a single replacement reaction?
A
AlCl3(aq) + 3KOH(aq) → Al(OH)3(s) + 3KCl(aq)
B
2Al(s) + 3Cl2(g) → 2AlCl3(s)
C
2AlCl3(s) → 2Al(s) + 3Cl2(g)
D
2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)
*select an answer for all questions
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